From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98064C282C6 for ; Thu, 24 Jan 2019 19:40:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 65F9E218FC for ; Thu, 24 Jan 2019 19:40:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548358818; bh=bvTiMCx58wxr1JwPuatWckEEhCMpbO3YhSfeE6wrA70=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZU2Ce9j5B5aWU1LvOXrx7qHTeJCbFqRwviUen/mkhgxKjpWvTDIIpAYO8QVRa6Hfb OA+61ovlC8hddakTH+jLa1MLY0R08Neji2cg5LAtbG8qbg31shieQRmAJ0+u6mYKku ZfZ2Phdajdb24KX4qVZ+2Hfo45kY/5gy/jor08C0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733226AbfAXTkQ (ORCPT ); Thu, 24 Jan 2019 14:40:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:40370 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733212AbfAXTkO (ORCPT ); Thu, 24 Jan 2019 14:40:14 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A180020663; Thu, 24 Jan 2019 19:40:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548358813; bh=bvTiMCx58wxr1JwPuatWckEEhCMpbO3YhSfeE6wrA70=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oEPukqOyvlteVBqaQa+wH2EP2xKBsy/2Z3XNolo07JGlfZcWOBy/44TcM/u++SJlJ AGG8Xon3SDUup4yNC1TX+GmzEkPHfmG/vOzeXM4Y3bhgr9Y7IG9PfruiMRrP72OWkY JGDkg5rRCGWZPzZf6uupFA1OVhSb6KRNiLuIvlO4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrew Lunn , "David S. Miller" Subject: [PATCH 4.20 004/127] net: dsa: mv88x6xxx: mv88e6390 errata Date: Thu, 24 Jan 2019 20:19:10 +0100 Message-Id: <20190124190212.223438946@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190124190211.984305387@linuxfoundation.org> References: <20190124190211.984305387@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrew Lunn [ Upstream commit ea89098ef9a574bceca00d3b5df14aaf0b3f9ccf ] The 6390 copper ports have an errata which require poking magic values into undocumented magic registers and then performing a software reset. Signed-off-by: Andrew Lunn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/dsa/mv88e6xxx/chip.c | 113 +++++++++++++++++++++++++++++++++++++++ drivers/net/dsa/mv88e6xxx/chip.h | 5 + drivers/net/dsa/mv88e6xxx/port.h | 10 +++ 3 files changed, 128 insertions(+) --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -2403,6 +2403,107 @@ static int mv88e6xxx_stats_setup(struct return mv88e6xxx_g1_stats_clear(chip); } +/* The mv88e6390 has some hidden registers used for debug and + * development. The errata also makes use of them. + */ +static int mv88e6390_hidden_write(struct mv88e6xxx_chip *chip, int port, + int reg, u16 val) +{ + u16 ctrl; + int err; + + err = mv88e6xxx_port_write(chip, PORT_RESERVED_1A_DATA_PORT, + PORT_RESERVED_1A, val); + if (err) + return err; + + ctrl = PORT_RESERVED_1A_BUSY | PORT_RESERVED_1A_WRITE | + PORT_RESERVED_1A_BLOCK | port << PORT_RESERVED_1A_PORT_SHIFT | + reg; + + return mv88e6xxx_port_write(chip, PORT_RESERVED_1A_CTRL_PORT, + PORT_RESERVED_1A, ctrl); +} + +static int mv88e6390_hidden_wait(struct mv88e6xxx_chip *chip) +{ + return mv88e6xxx_wait(chip, PORT_RESERVED_1A_CTRL_PORT, + PORT_RESERVED_1A, PORT_RESERVED_1A_BUSY); +} + + +static int mv88e6390_hidden_read(struct mv88e6xxx_chip *chip, int port, + int reg, u16 *val) +{ + u16 ctrl; + int err; + + ctrl = PORT_RESERVED_1A_BUSY | PORT_RESERVED_1A_READ | + PORT_RESERVED_1A_BLOCK | port << PORT_RESERVED_1A_PORT_SHIFT | + reg; + + err = mv88e6xxx_port_write(chip, PORT_RESERVED_1A_CTRL_PORT, + PORT_RESERVED_1A, ctrl); + if (err) + return err; + + err = mv88e6390_hidden_wait(chip); + if (err) + return err; + + return mv88e6xxx_port_read(chip, PORT_RESERVED_1A_DATA_PORT, + PORT_RESERVED_1A, val); +} + +/* Check if the errata has already been applied. */ +static bool mv88e6390_setup_errata_applied(struct mv88e6xxx_chip *chip) +{ + int port; + int err; + u16 val; + + for (port = 0; port < mv88e6xxx_num_ports(chip); port++) { + err = mv88e6390_hidden_read(chip, port, 0, &val); + if (err) { + dev_err(chip->dev, + "Error reading hidden register: %d\n", err); + return false; + } + if (val != 0x01c0) + return false; + } + + return true; +} + +/* The 6390 copper ports have an errata which require poking magic + * values into undocumented hidden registers and then performing a + * software reset. + */ +static int mv88e6390_setup_errata(struct mv88e6xxx_chip *chip) +{ + int port; + int err; + + if (mv88e6390_setup_errata_applied(chip)) + return 0; + + /* Set the ports into blocking mode */ + for (port = 0; port < mv88e6xxx_num_ports(chip); port++) { + err = mv88e6xxx_port_set_state(chip, port, BR_STATE_DISABLED); + if (err) + return err; + } + + for (port = 0; port < mv88e6xxx_num_ports(chip); port++) { + err = mv88e6390_hidden_write(chip, port, 0, 0x01c0); + if (err) + return err; + } + + return mv88e6xxx_software_reset(chip); +} + static int mv88e6xxx_setup(struct dsa_switch *ds) { struct mv88e6xxx_chip *chip = ds->priv; @@ -2415,6 +2516,12 @@ static int mv88e6xxx_setup(struct dsa_sw mutex_lock(&chip->reg_lock); + if (chip->info->ops->setup_errata) { + err = chip->info->ops->setup_errata(chip); + if (err) + goto unlock; + } + /* Cache the cmode of each port. */ for (i = 0; i < mv88e6xxx_num_ports(chip); i++) { if (chip->info->ops->port_get_cmode) { @@ -3215,6 +3322,7 @@ static const struct mv88e6xxx_ops mv88e6 static const struct mv88e6xxx_ops mv88e6190_ops = { /* MV88E6XXX_FAMILY_6390 */ + .setup_errata = mv88e6390_setup_errata, .irl_init_all = mv88e6390_g2_irl_init_all, .get_eeprom = mv88e6xxx_g2_get_eeprom8, .set_eeprom = mv88e6xxx_g2_set_eeprom8, @@ -3257,6 +3365,7 @@ static const struct mv88e6xxx_ops mv88e6 static const struct mv88e6xxx_ops mv88e6190x_ops = { /* MV88E6XXX_FAMILY_6390 */ + .setup_errata = mv88e6390_setup_errata, .irl_init_all = mv88e6390_g2_irl_init_all, .get_eeprom = mv88e6xxx_g2_get_eeprom8, .set_eeprom = mv88e6xxx_g2_set_eeprom8, @@ -3299,6 +3408,7 @@ static const struct mv88e6xxx_ops mv88e6 static const struct mv88e6xxx_ops mv88e6191_ops = { /* MV88E6XXX_FAMILY_6390 */ + .setup_errata = mv88e6390_setup_errata, .irl_init_all = mv88e6390_g2_irl_init_all, .get_eeprom = mv88e6xxx_g2_get_eeprom8, .set_eeprom = mv88e6xxx_g2_set_eeprom8, @@ -3390,6 +3500,7 @@ static const struct mv88e6xxx_ops mv88e6 static const struct mv88e6xxx_ops mv88e6290_ops = { /* MV88E6XXX_FAMILY_6390 */ + .setup_errata = mv88e6390_setup_errata, .irl_init_all = mv88e6390_g2_irl_init_all, .get_eeprom = mv88e6xxx_g2_get_eeprom8, .set_eeprom = mv88e6xxx_g2_set_eeprom8, @@ -3693,6 +3804,7 @@ static const struct mv88e6xxx_ops mv88e6 static const struct mv88e6xxx_ops mv88e6390_ops = { /* MV88E6XXX_FAMILY_6390 */ + .setup_errata = mv88e6390_setup_errata, .irl_init_all = mv88e6390_g2_irl_init_all, .get_eeprom = mv88e6xxx_g2_get_eeprom8, .set_eeprom = mv88e6xxx_g2_set_eeprom8, @@ -3740,6 +3852,7 @@ static const struct mv88e6xxx_ops mv88e6 static const struct mv88e6xxx_ops mv88e6390x_ops = { /* MV88E6XXX_FAMILY_6390 */ + .setup_errata = mv88e6390_setup_errata, .irl_init_all = mv88e6390_g2_irl_init_all, .get_eeprom = mv88e6xxx_g2_get_eeprom8, .set_eeprom = mv88e6xxx_g2_set_eeprom8, --- a/drivers/net/dsa/mv88e6xxx/chip.h +++ b/drivers/net/dsa/mv88e6xxx/chip.h @@ -300,6 +300,11 @@ struct mv88e6xxx_mdio_bus { }; struct mv88e6xxx_ops { + /* Switch Setup Errata, called early in the switch setup to + * allow any errata actions to be performed + */ + int (*setup_errata)(struct mv88e6xxx_chip *chip); + int (*ieee_pri_map)(struct mv88e6xxx_chip *chip); int (*ip_pri_map)(struct mv88e6xxx_chip *chip); --- a/drivers/net/dsa/mv88e6xxx/port.h +++ b/drivers/net/dsa/mv88e6xxx/port.h @@ -251,6 +251,16 @@ /* Offset 0x19: Port IEEE Priority Remapping Registers (4-7) */ #define MV88E6095_PORT_IEEE_PRIO_REMAP_4567 0x19 +/* Offset 0x1a: Magic undocumented errata register */ +#define PORT_RESERVED_1A 0x1a +#define PORT_RESERVED_1A_BUSY BIT(15) +#define PORT_RESERVED_1A_WRITE BIT(14) +#define PORT_RESERVED_1A_READ 0 +#define PORT_RESERVED_1A_PORT_SHIFT 5 +#define PORT_RESERVED_1A_BLOCK (0xf << 10) +#define PORT_RESERVED_1A_CTRL_PORT 4 +#define PORT_RESERVED_1A_DATA_PORT 5 + int mv88e6xxx_port_read(struct mv88e6xxx_chip *chip, int port, int reg, u16 *val); int mv88e6xxx_port_write(struct mv88e6xxx_chip *chip, int port, int reg,